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Bias01:22

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Bias refers to any tendency that prevents a question from being considered unprejudiced. In research, bias occurs when one outcome or answer is selected or encouraged over others in sampling or testing. Bias can occur during any research phase, including study design, data collection, analysis, and publication.
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Measuring Sensitivity to Viewpoint Change with and without Stereoscopic Cues
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Radial Bias Alters Perceived Object Orientation.

Melisa Menceloglu1, Ken Nakayama2, Joo-Hyun Song1,3

  • 1Department of Cognitive, Linguistic & Psychological Sciences, Brown University.

Psychological Science
|October 17, 2022
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Visual perception favors radial orientations, leading to illusions where objects appear tilted towards the center of gaze. This study reveals an early-vision bias influencing perceived object orientation.

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orientation sensitivityradial biasvisual perception

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Area of Science:

  • Visual perception
  • Neuroscience
  • Psychophysics

Background:

  • The visual system exhibits orientation sensitivity, with radial stimuli eliciting stronger responses.
  • Radial orientations, aligned with the gaze center, are processed with heightened perceptual sensitivity.
  • A visual illusion linked to this orientation preference is explored.

Purpose of the Study:

  • To investigate a visual illusion related to the visual system's preference for radial orientations.
  • To quantify the influence of stimulus orientation on perceived gap position.
  • To demonstrate an early-vision mechanism affecting object orientation perception.

Main Methods:

  • Participants (N=36) performed a continuous response task to indicate gap position.
  • A Landolt C stimulus was presented at various orientations and peripheral locations.
  • Error distributions were analyzed to assess perceived gap attraction.

Main Results:

  • Perceived gap position showed a significant attraction towards the radial axis.
  • Stimuli were often misperceived as tilted towards the nearest radial or oblique meridian.
  • This attraction indicates a bias in early visual processing.

Conclusions:

  • The visual system demonstrates a bias towards radial orientations, influencing perception.
  • An early-vision mechanism demonstrably affects the perceived orientation of objects.
  • This finding highlights an unsuspected influence on visual object representation.